Road safety design standards and the Asian Highway Network irap Asia Pacific Workshop Greg Smith (greg.smith@irap.org) 2016/05/26
AH Standard Summary While developing the Asian Highway network, Parties shall give full consideration to issues of safety.
Road safety in AH Network countries Serious crashes tend to be concentrated. Eg 33% of deaths in India occur on National Highways, which account for around 3% of roads High death rates on some road sections: 0.42 deaths /km /year in Bangladesh 0.61 deaths /km /year in Indonesia 1.9 deaths /km /year in India By comparison: 0.07 deaths /km /year: highest risk road in the UK
Managing risk for pedestrians and bicyclists Pedestrian crossings with refuge islands Sidewalks Pedestrian fences Bicycle lanes Traffic calming Street lighting
Managing risk for vehicle occupants and motorcyclists Run-off road crashes: Delineation Audio-tactile lines Forgiving roadsides (including specialist motorcycle barriers where motorcycle volumes are high) Skid resistance
Managing risk for vehicle occupants and motorcyclists Head-on crashes: Delineation Audio-tactile lines Skid resistance Median treatments such as safety barriers and wide centrelines Overtaking lanes
Managing risk for vehicle occupants and motorcyclists Intersection and rear-end crashes: Delineation Priority control Rectification of skewed intersections Provision of protected turn lanes Intersection channelization Lighting Skid resistance Roundabouts Managing gaps in medians
Managing risk for vehicle occupants and motorcyclists Exclusive and non-exclusive motorcycle lanes
Class II Rolling terrain, design speed 60km/h (Typical curve and intersection frequency) Relative risk of vehicle occupant death or serious injury 1.00 Baseline + improved delineation 0.77 + shoulder rumble strips 0.65 + roadside clearzone/barriers + wide centreline 1 star 2 stars 0.51 0.35 3 stars 4 stars
Class II Rolling terrain, design speed 60km/h (Typical curve and intersection frequency) Relative risk of vehicle occupant death or serious injury 1.00 Baseline + improved delineation 0.77 + shoulder rumble strips 0.65 + roadside clearzone/barriers + wide centreline 1 star 2 stars 0.51 0.35 3 stars 4 stars
Class II Rolling terrain, design speed 60km/h (Typical curve and intersection frequency) Relative risk of vehicle occupant death or serious injury 1.00 Baseline + improved delineation 0.77 + shoulder rumble strips 0.65 + roadside clearzone/barriers + wide centreline 1 star 2 stars 0.51 0.35 3 stars 4 stars
Class II Rolling terrain, design speed 60km/h (Typical curve and intersection frequency) Relative risk of vehicle occupant death or serious injury 1.00 Baseline + improved delineation 0.77 + shoulder rumble strips 0.65 + roadside clearzone/barriers + wide centreline 1 star 2 stars 0.51 0.35 3 stars 4 stars
Class II Rolling terrain, design speed 60km/h (Typical curve and intersection frequency) Relative risk of vehicle occupant death or serious injury 1.00 Baseline + improved delineation 0.77 + shoulder rumble strips 0.65 + roadside clearzone/barriers + wide centreline 1 star 2 stars 0.51 0.35 3 stars 4 stars
Example of vehicle occupant star ratings L = level R = rolling M = mountainous S = steep Primary Design speed (km/h) Class I Class II L R M S L R M S L R M S 120 100 80 60 100 80 50 50 80 60 50 40 Baseline * + delineation + rumble strips + roadside clearzone/barriers + median treatment + int. quality + int. lighting + protected turn lanes + chanelization 1 star 2 stars 3 stars 4 stars 5 stars * Based on typical curve and intersection frequency and roadside hazards
Example of vehicle occupant star ratings L = level R = rolling M = mountainous S = steep Primary Design speed (km/h) Class I Class II L R M S L R M S L R M S 120 100 80 60 100 80 50 50 80 60 50 40 Baseline * + delineation + rumble strips + roadside clearzone/barriers + median treatment + int. quality + int. lighting + protected turn lanes + chanelization 1 star 2 stars 3 stars 4 stars 5 stars * Based on typical curve and intersection frequency and roadside hazards
Example of vehicle occupant star ratings L = level R = rolling M = mountainous S = steep Primary Design speed (km/h) Class I Class II L R M S L R M S L R M S 120 100 80 60 100 80 50 50 80 60 50 40 Baseline * + delineation + rumble strips + roadside clearzone/barriers + median treatment + int. quality + int. lighting + protected turn lanes + chanelization 1 star 2 stars 3 stars 4 stars 5 stars * Based on typical curve and intersection frequency and roadside hazards
Next steps 1. Survey of ESCAP member countries 2. Finalize list of road safety facilities 3. Draft specifications for safety facilities and their expected effect on risk (star ratings) 4. Consultation with ESCAP member countries on draft specifications, including workshop 5. Revision of specifications 6. Finalize specifications